Mathematics, 21.04.2020 16:54 LlayahHarbin
A department store wants to know what fraction of its customers in a certain market have store credit cards, and what their average balance might be. Of the 120 customers surveyed, 30 had store credit cards. Amongst those customers, the average balance was $600, with a sample standard deviation of $80. Find the 98% confidence interval for the average credit card balance. ( , ) Round your answers to two decimal places.
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A department store wants to know what fraction of its customers in a certain market have store credi...
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